Created: 2011-07-08 19:03
Updated: 2017-12-19 20:05
License: mit



An end-to-end web framework for JavaScript and ASP.NET.

What is it?

ExoWeb aims to provide a rich JavaScript object model, intuitive UI code based on the fundamental languages of the web (HTML, CSS, and JavaScript), model- and UI-driven validation, and seamless synchronization of changes between client and server.

Object Model

Using the open source ExoModel library, a server-side object model, e.g., Entity Framework or NHibernate, can be represented in a basic form on the client (check out the ExoModel project page for support details). This client-side model is built and modified based on JSON, which can be fetched from the server as needed. Each model type is represented by a unique JavaScript type of the same name. For this reason, mixing of these generated types with intrinsic JavaScript types (String, Number, etc) should be relatively transparent and easy. Also, types can be extended on the client to add additional behavior or properties.

Instances can be fetched from the server using a simple querying interface, or they can be created on the client. Changes to the model are detected - including property value changes, list modification, and creating and deleting objects. These changes can trigger rules, drive UI behavior, and are replayed on the server with each asynchronous request.

User Interface

The UI strategy is currently based on the open source ASP.NET AJAX library's client-side templates, which are designed to be intuitive for someone who is familiar with the fundamental languages of the web: HTML, CSS, and JavaScript. Some notable additions are: dynamic template selection, toggling, metadata, and lazy loading.

Rules & Validation

Properties on the model can be calculated based on the values of other properties. When changes occur to those properties, the calculated value is automatically updated. It is also possible to define arbitrary rule logic that is triggered by property changes.

Characteristics of the server-side model can enable some validation automatically based on type metadata. These validation rules react to user input in order to provide immediate feedback, which can be styled to your liking. Information about these issues is embedded in the model until resolved.

Client-Server Synchronization

The ExoWeb client model maintains a set of events that have occurred, whether on the client or the server. These events are replayed on the server as needed, which allows for the client and server models to be kept in sync. Also, operations can easily be moved to the client to improve performance but can remain on the server when this is not appropriate or practical.

More Information

Check out the wiki, the Todo App Walkthrough, and the following blog posts:

A Brief Introduction to ExoWeb

Intro to Client-Server Mapping in ExoWeb

ExoWeb's Entity System

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